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Santa Monica, CA: Rand Corp, 2005
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[Erscheinungsort nicht ermittelbar]: RAND Corporation, 2005
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[S.l.]: SSRN, [2015]
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[Erscheinungsort nicht ermittelbar]: RAND Corporation, 2003
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Informa UK Limited, 1998
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Springer Science and Business Media LLC, 1985
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American Association for the Advancement of Science, 2013
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Springer Science and Business Media LLC, 2010
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Informa UK Limited, 1997